A One-Step Biocatalytic Process for (<i>S</i>)-4-Chloro-3-hydroxybutyronitrile using Halohydrin Dehalogenase: A Chiral Building Block for Atorvastatin
作者:Nan-Wei Wan、Zhi-Qiang Liu、Feng Xue、Zhen-Yang Shen、Yu-Guo Zheng
DOI:10.1002/cctc.201500453
日期:2015.8.17
(S)‐4‐Chloro‐3‐hydroxybutyronitrile [(S)‐CHBN] was used as a chiral building block for the preparation of atorvastatin. In this study, (R,S)‐epichlorohydrin [(R,S)‐ECH] and 1,3‐dichloro‐2‐propanol (1,3‐DCP) were investigated to prepare (S)‐CHBN by using the halohydrin dehalogenase HheC from Agrobacterium radiobacter AD1. Preparing (S)‐CHBN from (R,S)‐ECH gave a modest enantiomeric excess (ee), whereas
(S)-4-氯-3-羟基丁腈[(S)-CHBN]被用作制备阿托伐他汀的手性构件。在这项研究中,研究了(R,S)-表氯醇[(R,S)-ECH]和1,3-二氯-2-丙醇(1,3-DCP),使用卤代醇制备(S)-CHBN根癌土壤杆菌AD1中的脱卤素酶HheC 。由(R,S)-ECH制备(S)-CHBN产生适度的对映体过量(ee),而以1,3-DCP为底物,得到(S)-CHBN的ee值为97.3% pH优化后。但是,如果底物浓度增加到10 g L -1,则ee值低且(S)-CHBN 收率低。为了获得更高的ee值和产量,构建并筛选了16个突变体。鉴定出具有改善的活性和对映选择性的W249F变体,并将其应用于10 g L -1的1,3-DCP负载下 ,从而在1小时内以86%的收率获得了(S)-CHBN,ee达到97.5% ee。这是从前手性1,3-DCP制备(S)-CHBN的一步式生物催化过程的第一份报告。